OP Father + Cute Child its ok if the father is not strong... Recommend me something like https://www.novelupdates.com/series/daddy-fantasy-world-restaurant/ & https://www.novelupdates.com/series/house-dads-literary-life/ Doesnt matter if its not translated, as long as it is similar.
https://www.novelupdates.com/series/isekai-yururi-kikou-raising-children-while-being-an-adventurer/ https://www.novelupdates.com/series/if-its-for-my-daughter-id-even-defeat-a-demon-lord/
Maybe something like: Uchi no Musume Isekai Yururi Kikou (foster older brother) Mangas: Maou-sama, Retry! Beelzebub Usagi Drop (slice of life) Gakuen Babysitter (older brother & baby brother) Aishiteruze Baby Shirogane no Nina (uncle & niece)