BL manga with MCs as parents/guardians

A man and his kid find a drunk man lying in the rain and take him in.
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• child is in primary school

Two men with a shaky past are neighbors, only brought together by their 7-year-olds.
(ch 1 - 2)
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• children are both 7 years old
• chapter 3 is about the (now teenage) sons

A date doesn't go as planned when one boyfriend shows up with two kids latched onto him.
(ch 4)
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• children are 5 years old and around pre-primary school age

Kai Hisae lives with his daughter, helping her to take care of her own daughter. One day, while walking home, Hisae happens upon a mysterious book, and inadvertently ends up summoning a demon named Hakuo. Hakuo offers Hisae a wish, but Hisae is uninterested. Adamant, Hakuo refuses to leave until Hisae has made a wish. Hakuo and his family's lives are about to get a whole lot stranger.
(ch 3 - 5.5)
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• grandchild is in primary school

A dying race goes to extremes in an attempt to continue their species, and an unlucky human is caught in the middle.
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• child starts as a newborn
• ten year age gap
• not omegaverse; uke is intersex and seems to identify as male (possibly bigender? it's kind of vague), so the baby is biologically both uke's and seme's
• child appears later in the story
• I feel the need to note that this series is super fucked up, and not in a good way

A widower's daughter tries to get her dad back into the dating game by having him get a makeover. The man in charge of the makeover soon finds himself smitten by his customer.
(pp 46 - 87, 207 - 219)
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• child is a senior in high school

A single, overprotective father and his child have moved in next door to Sudou. After witnessing a scene between him and another man, they find out that Sudou is gay, though neither seem to mind. Sudou finds himself attracted to the single father.
(ch 5)
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• child is 6 years old

After a night of drinking, Kazuya wakes up in an unfamiliar house. The house belongs to Tsuji and his young son, Shunsuke, who decided to take him to their home while he sobered up. Kazuya starts spending time with the two, and his feelings for Tsuji soon turn into something more than friendship.
(ch 5 - 6)
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• child is 3 years old

While eating a homemade rice ball by himself in the park, Yutaka is approached by a young boy who asks if he can eat it. The boy's brother comes by and scolds him, and the three part ways. Just when Yutaka thinks he's done with them, the two show up the next day, the older brother asking if Yutaka can teach him how to make the rice balls his little brother loves so much. Finally, Yutaka has something to look forward to.
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• child is around pre-primary school age

A man meets his beloved sempai years after high school.
(ch 7)
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• child is 16 years old
• chapter 6 is about the son