BL manga with MCs as parents/guardians

Sequel to chapter 7 of "Bousou Kareshi"
(ch 5 - 6)
• &
• actual child is 16 years old and child being watched over is a baby
• chapters 3 - 4 are about the son

Two undercover agents reunite after two years apart, but their relationship goes much deeper.
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• child is 9 years old

Sequel to "Buddy System"
(ch 1 & 4 - 5)
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• child is 10 years old

Runaway Riku asks his friend, Joutarou, to sneak into the house to steal some things for Riku and check in on his father, Harumi. He's caught on the act by Harumi, and makes a deal with him that he will occasionally with information on Riku. After meeting with Harumi every day to give him information (and make sure he's not lonely), Joutarou eventually starts seeing the angry father in a new light.
(ch 5)
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• child is in high school
• 14+ year age gap

A story about two childhood friends spanning throughout most of their lives. Tragic and joyful, beautiful and cringe worthy, an absolutely amazing and unforgettable tale.
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A single father meets his eldest's dreamy teacher.
(ch 5)
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• children are in sixth grade and primary school

Primary school teacher Odagiri Itaru goes to his student, Aoyagi Rikuto’s house to find out why he has been falling asleep during class. It turns out that Rikuto has been staying up helping his mangaka father, Kaiji, with his work. Itaru continues to visit Rikuto's house to see how he's doing, and overtime he begins to develop feelings for Kaiji.
(p 52)
•
• child is in fifth grade (there's also a brief extra in which he is in junior high)

Hino, a misunderstood high school student, takes care of his sister's son. After finding out that his classmate, Mizusawa, is an amazing cook, Hino starts inviting him over to make sweets for his young nephew.
•
• child is a toddler

Naoto meets his old classmate, Madoka, at their twenty year middle school reunion. When Naito mentions his financial troubles, Madoka offers to let Naito stay at his house for the time being. What they don't know is that another guest is going to be arriving.
(ch 2)
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• child is 15 years old
• chapters 1 - 3 of "Shinu Hodo Suki" are a spin-off about the son

Kanade Sakuza loves animals and small children. Unfortunately, the feeling isn't mutual, and he ends up chasing them all away. Ironic, considering his old friend, Tomioka Sakito, owns a dog café. Tomioka's feelings for Kanade are more than friendship, and when their relationship finally starts to develop, Kanade learns that Tomioka is married and has a kid.
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• child is pre-primary school