 If you liked
Kazoku ni Narou yo
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 ...then you might like
Family Simulation!!
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Both manga feature a woman, close to the MC (who has never had a child of his own), who dumps her child on him because she has to go abroad due to 'unavoidable' reasons.
While one manga features an established gay couple and the other features a newly gay couple, both manga are fun and cute reads and remind me of each other due to their similar premise.