Lincoln – Surf the internet, donate for his favourite youtubers, streamers.
Lori – Cook for her family, read books.
Leni – Text with Chaz, watching kid shows.
Luna – Help other sisters doing their things, write mails for Sam (rarely).
Luan – Read books, playing shuttlecock with her foots.
Lynn Jr – Play video games (if she got grounded from playing sports), go hiking or jogging.
Lucy – Help Lynn Jr counting time in jogging, scare the others, talking with bats, stare at anyone she chooses.
Lana – Fry, burn, and crush her old tools (when they can't be recycle or use anymore).
Lola – Rate Lori's cooking food, get revenge on someone or more than a person (if they hurt people she loves).
Lisa – Create gadgets (when she's got nothing to do), read books, listening to the music on radio.
Lily – Watching normal kids show and young artists drawing.
Lynn Sr – Help his wife come up with ideas, rate Lori's cooking food.
Rita – Help her husband's cooking, read other novels to make an inspiration in her works, watching animals world show with her daughter, Lana.
They still having original hobby, but I added more.
P/S: Lana had the animal-lover thing from her mom, basically a gene passed from mother to daughter.