All the Angel family-vibe fics that come to mind are all Kari's but I think Angel is Angel rather than Angelus for a least the majority of the fics but mainly because the full separation of his unsouled persona is removed somewhat in them I think.
It is a while since I read it but I think
Primal by kari mouke is very family based (a/dr b/s) but I'm pretty sure Angel remains souled in it, but it has the family feel in spades (as much as I remember).
Similarly,
The Fallout by Kari Mouke has the four a/dr/b/s together but I am uncertain if Angel is souled or not. I think Buffy is some slayer/vamp hybrid in this one.
Another one by Kari Mouke that is mostly dr/s/b but incorporates a as well (towards the end as I remember) is
Taking the Initiative. I am pretty sure the family thing incorporates him as Angelus but that change is right at the very end.