Wakamono Tachi bears a strong resemblance to Under One Roof to an astounding degree. There might be more siblings in Under One Roof, but those in Wakamono Tachi share the same issues as many of them (albeit mixed around). The eldest brother in each is a hard-working, lovable goofball who talks loud and fast. There's a lot of bickering at the table, a young sister having an affair with an older man at work, etc. But aside from these and other similarities, both are warm family dramas with a lot of heart and a good message. Plus, they each have "the cast of the decade," so to speak.
Although Wakamonotachi isn't exactly story about fatherhood/parenthood, the mains are really similiar - Asahi and Yasu are so stupid but at the same time incredible warm characters. Both stories tells about importance of family and both stories can make you cry. But there is no gooey dialogues and no "bad characters". There is just life that make people face many different (happy and difficult) situations.