But just one really - I am having so much trouble remembering what this one is called!!

I'll tell you what i can remember:

The family is a single mother, big bro and younger bro. Big bro acts like the dad and younger bro always runs away to big bros friends house cue love story there, then later in the manga the mother gets remarried and they get a new step brother (with glasses if I remember correctly....) cue second love story with big bro and the step brother

I hope this is sounding familiar to you because right now I have poo brain....

=.="

Relax, would you? We have seventy dollars and a pair of girls underpants. We're safe as kittens.

Suki no Mebae