http://www.batoto.net/comic/_/comics/taiyou-no-ie-r1331
Pretty god tier slice of life shoujo manga. You should read it, lol.
Main character Mao is feeling neglected due to her parents going through a divorce. When she feels alone, she is invited to play and have dinner at the neighbour/large family's house across the street. The other family has three children; two older brothers, and a young girl.
At some point while they are still children, the parents of that family pass away due to a tragic accident. The younger children are sent off to live with relatives, but the eldest brother holds onto the house with the wish that they can live together again.
Mao chose to stay with her father after the divorce because her mother was getting married to an unfamiliar man. Now, however, her father is getting remarried, and she feels like she no longer has a place. Running into Hiro again, they awkwardly build up a relationship together while remembering their memories of the past.
Four volumes are currently out in Japan. Let's hope that this will grow into a long-lived and healthy thread, lol.