A couple points worth mentioning...

If the parents you are looking at are hybrids themselves, especially complex hybrids, there is a lot of hidden variability that can come as a complete surprise in the offspring. Look at the ancestry of each parent and if there is some species in the background of both parents in a significant percentage, that may be the best indication of flower shape to expect, rather than the shape of either parent.

There are cases of certain flower shapes being more dominant no matter which side of the family they come from, but that depends on the genetics of that trait. The only way to know is to look at similar crosses and see what you see.

Mitochondrial and chloroplast DNA from the mother line can have a bigger effect on overall vigor, temperature and light preferences, green or yellow color distribution, but not usually on flower shape.

If you care to mention the specific cross you are looking at I might have a guess for you if it is a type of breeding line I'm familiar with.