Alpha no Ie no Ko
So Haruto is Riku's uncle now they're married LOL Grandfather should've died.
The Pure☆Knight’s Shining Journey: The Road Home
Ibitsuna Bokura no Katachi
read ch 12.6 Story summary for myself: romance between man (blonde) with daughter (Maika) and her piano teacher (black). Maika lives near piano teacher's mother who she considers a grandmother. The man isn't actually her father. When Maika was young her father got cancer and during this time he befriended the man and eventually adopted him thus when he died (from a car accident not from cancer; though papa's mother did die from cancer) Maika lived with the man (technically is her brother by law not blood - but she calls him Papa). Maika wants her papa and sensei to fall in love because she thinks sensei will look after her papa. In the latest chapter she snuck off to go to a shrine to wish for her Papa's love to succeed. She overslept on the train back and had to call sensei as she left her phone at home and only knew piano class number. Sensei, his mother and papa come to collect her. During which her papa is mad at her as she won't tell him why she kept it a secret or where she went. She runs off and sensei grabs her preventing a car from hitting her. Papa raises his hand but stops and then yells at her asking if she remembers what happened to her father. Maika says she would always remember then runs to sensei's mother to cry. ;;;;; maika ;;;; RESOLUTION!!! And Sensei isn't blood-related to his mother either. Seems romance may be starting now ooo
Suda-kun no Himitsu