I think it's interesting, how much Cera's dad has changed since the first film.
He is still the same in the earlier films, voicing racism to Cera in the second film, and remaining superior in the third film. Grandpa Longneck saving his life may have heralded the change.
Interestingly, he is not present in the fourth film. Although he might not have been interested in meeting a longneck herd, he might have found it awkward to visit the potential deathbed of one who had been his rival for a while.
In the fifth, we see his old anger again, although this is out of fear for his families' survival. In the sixth, apart from complaining about Doc and the twins, he actually appears to be completely friendly, from casually talking with Grandpa Longneck, to even apologising for upsetting Littlefoot. The Topps of the older films would not have done that happily. He has changed for the better.
The rest of the films seem to show that despite keeping a short temper, he has a vague friendship with Littlefoot's family (Such as shown with the snowfight, or in nine, where he sends Littlefoot away. He was grumpy, but he acknowledged his existence, something the Topps of the early films would not have), and truly cares for the valley's denizens.
Something I wonder is, If something awful befell Littlefoot's Grandparents, would Topps actually take responsibility for Littlefoot? I can see him sympathising (And possibly being swayed by Tria and Cera). If he didn't, Ducky's mother would certainly look after him, and maybe even Petrie's mother (Although he wouldn't exactly be able to live with them in their high nest). But it's still an interesting thought. Despite his grumpiness, how much does he care?