I don’t think it’s parental.
First, it should be noted that the comics can’t be taken as definitive evidence of how things will play out in the MCU, because director James Gunn has confirmed one fairly important piece of information about Star Lord’s parentage that diverges from the comics:
The most important thing Gunn said seemed to be this:
“It’s definitely not the character who it is in the comics, I’ll say that much.”
— James Gunn talks Guardians of the Galaxy 2 and Who is Star-Lord’s Daddy (Aug 2014)
If he’s willing to change that, then he may also change other things, such as Yondu’s relationship with Quill.
At a session in Bangkok, he made more comments about when Starlord’s Father might appear in the MCU, which makes it sound to me like he hasn’t appeared yet:
He also was asked to clarify if Star-Lord’s father would be in Guardians Of The Galaxy 2? Gunn replied,
“He’ll… be showing up pretty soon”.
— Star Lord’s Father might show up sooner than Guardians of the Galaxy 2
From the first piece, we do learn that a lot of thought has been given to Yondu’s relationship with Quill, but it sounds distinctly like a guardian-like relationship, not a parental one:
There have been a lot of documents passed around about who Peter Quill’s father is, and things like that, between a select two or three of us. That’s been part of the plan since the beginning, that’s something I had to work out and I worked it out before we shot the screenplay. We wanted to make sure Yondu’s place in everything made sense and it does, so it’s all very specific stuff.
Personally, I don’t recall any comments that would suggest Yondu is Quill’s father. For me, it seemed consistent with what we saw: Yondu picked up Quill from Earth when he was still very young, and acted as his guardian until he was old enough to work on his own.
I think that’s it: Yondu is Quill’s guardian, not his father.
Now, is there a reason he picked up Quill? What’s his relationship with Quill’s father? That has yet to be established, but given the [fact revealed in the first spoiler block], I don’t know how much we can really infer from the comics.