Gaoshun clearly is having fatherly pains, hang in there bro, I have no doubts you are an awesome dad.
Maomao situation is complicated, to say the least, yes she is being immature but at the same time she doesn't really need to see Rakan as her father, Ruomen is her father, and objectively speaking he is responsible for who she is, but Rakan didn't abandon her and her mother out of malice or even planned for that, he loves those two and I bet he would give anything in the world to be with them.
The point here is that there isn't a clear or right answer, if Rakan continues to try (and I bet he will) he may conquer a part in Maomao heart and if she herself find a new view in life she may just give that part to him someday, but until then this is their plight to live.
And the fact that we feel their situation so personally is proof that these characters lives well written.