Aishiteruze Baby★★, Chocotto Sister Recommendations
due to the story in both series although different they share subplots to some extent
Both series have children and brotherly relationships.
Both series focuses on a main male protagonist who takes cares of a younger girl. It focuses on him taking on a parent-like role and showing responsibility as each episodes progresses.
Both series has a slice of life feeling where there each episodes is presented in an episodic like sequence.
Both series has hints of romance, comedy, drama, and many instances of parenting.