Unfortunately, in my family we pray together only a few times per year: Pascha, Christmas, Slava, Epiphany.
However, I hope that one day when I start my own family, I pray with my husband (and if I have children,with them too) the Morning and Evening prayers every day and for festal days something special. I've read that praying together integrates family and prevents divorces.
I probably would make just one exception: prayers before Eucharists, because not always the whole family stands in line for it and I think it's very personal.
As for friends, I pray with them together only during pilgrimages.