Lily was about to respond when she was interrupted by her husband, "Even if what you say about soul mates is true and that it applies to my son, why would we marry off our only son when he is barely one year old?"
Dumbledore had been expecting some resistance to the idea so he was not surprised by James' apprehension so he replied, "I can assure you what I said is in fact true and it does indeed apply to your son. As to why you would accept such extreme measures is simple. There is no other choice. If they were not to be married you would be forced to hand over Ginevra to the ministry where she will likely be placed with some family like the Malfoy's, where she will most likely be married off to their son in order to obtain all the Weasley assets including their Wizengamot seat.
"By keeping them together you will give your son the chance to grow up with the person that would under normal circumstances eventually be his wife anyways if they ended up getting to know one another. Additionally, there is no telling what could possibly happen to their mental state if somebody actually tried to forcibly separate them at this time."
"But, But, fine. I see there is no other option but it does not mean that I like doing this." James resigned himself to what needed to be done.
Lily on the other hand still seemed apprehensive as she asked, "Even if we agree to do this wouldn't this be breaking multiple laws?"
Dumbledore smiled at this as he responded, "As long as James gives his permission as head of the House of Potter we should remain within the limits of the law. As Headmaster of Hogwarts School of Witchcraft and Wizardry I can represent the welfare of any child that is currently attending or is set to attend Hogwarts. Due to Ginevra having already been enrolled in the school by her parents, like most pureblood families, I can represent her interests in a situation where her current guardians would be unable to. Additionally, my position of Chief Warlock of the Wizengamot grants me the ability to perform a Wedding Charm on any couple who choose to be wed."
The mentioning of a Wedding Charm reminded Lily of another potential problem of marrying kids at that age and so she directed her thoughts to Dumbledore, "Wouldn't the use of a Wedding Charm place a compulsion on the two to consummate the marriage within a week or face becoming deathly sick?"
"Yes, the placement of the normal wedding charm would indeed place a compulsion on them to participate in intercourse to satisfy the marriage contract. But the wedding charm I would be using is a lesser known one that has been used in arranged marriages to ensure that neither family backs out on the arrangement. The charm will marry them like the regular marriage charm but instead of a one week compulsion it has a ten year requirement. If that requirement is not met then a compulsion will be activated on the couple to encourage them to participate in intercourse with each other.
"If my calculations are correct, this will place the compulsion to appear shortly after Harry's 11th and Ginevra's 10th birthday which still would be young for normally developed kids but with the proper potions and magic training they will be mentally, physically, and emotionally adults by the time the compulsion would be activated."
James realized that this would be pushing on some ethical boundaries, but he could not come up with any way to avoid this without allowing a darker family to do the same thing for much more nefarious purposes while psychologically damaging both children in the process. So with a glance at his wife to confirm her agreement in this he sighed and gave his consent to Dumbledore, "We do not like this but we are not naive and realize that there is no other option but the one you have given us. What is it you need us to do in order to perform this charm on the children."
Dumbledore took out his wand and conjured a long sheet of parchment. He quickly read over the conjured parchment to ensure everything was in order. When he confirmed that he had conjured the correct contract he waved his wand over Harry causing the tip of his wand to glow red. Then he waved his wand over the parchment causing the name Harry James Potter to appear in blood on the sheet in the spot where the grooms name should be written. He repeated the same procedure with Ginevra until the name Ginevra Molly Weasley appeared likewise in blood where the brides name should be written.
Dumbledore then took out a quill and signed his name below Ginevra's name, the special type of quill causing his name to be signed in blood taken directly from his hand. He then handed the quill to James and said, "Use the Blood Quill to sign your name below Harry's to accept Ginevra into the House of Potter."
James took the quill from Dumbledore and did as directed, signing his name in blood below Harry's name. Dumbledore took the parchment and quill back from him and then put the quill away and read over the parchment to make sure everything was in order.
When he was sure everything was in order he started waving his wand over the two still sleeping kids while speaking an incantation. This went on for a minute before golden ethereal ropes appeared and wrapped themselves around the children. When the ropes were in place a golden aura began to emanate from each of the children where they lay entwined. After a minute the auras seemed to coalesce into a single sphere around the couple. The sphere steadily grew larger and brighter until it seemed to encompass the whole room. The sphere pulsated a few times sending off a flash of light each time. Immediately after the 5th pulse the sphere rapidly shrunk until it just encompassed the kids before it imploded. When it was done a golden ring appeared on each of the children's left ring finger and on the parchment where their names had been signed in blood a name had been changed. Ginevra Molly Weasley was now listed as Ginevra Molly Potter.