following~
some of them may not be as wholesome as it is in "I Became the Hero's Mom" but hope they can help:
https://www.mangago.zone/read-manga/goblin_dad/
https://www.mangago.zone/read-manga/i_became_the_villain_s_mother/
https://www.mangago.zone/read-manga/i_gave_birth_to_a_murderer_s_child/
https://www.mangago.zone/read-manga/papa_wolf_and_the_puppy/
https://www.mangago.zone/read-manga/the_demon_babysitter/
https://www.mangago.zone/read-manga/duchess_of_the_glass_house/
https://www.mangago.zone/read-manga/i_will_change_the_genre/
https://www.mangago.zone/read-manga/my_crazy_journalist_wife_mangatsu/
https://www.mangago.zone/read-manga/metamorphosis/
Father-son relationship,
Like this reincarnation, Isekai romance similar to (male lead stepmom? I forgot the title)