Tanaka-ke, Tensei suru.

Do you like cats? Do you like isekai? Do you like dying horribly in an earthquake with your whole family? Then you'd fit right in with the Tanaka family! They might not have enjoyed that last part, but they're certainly enjoying their new life in another world as the esteemed Stewart family. That's right—the whole family reincarnated together, and they're just as messy as they were in their first life. Kazushi (65) and Yoriko Tanaka (65) are now the esteemed Leonard (35) and Melsa (35) Stewart. Their three children, Wataru (38), Minato (35), and Heita (33) are now George (15), Emma (12), and William (9) Stewart. Come follow the Tanakas—or Stewarts—as they navigate high society with tea parties, marriage propositions, fashion design, bugs, monsters, and most importantly, giant cats!

(Source: J-Novel Club)