Is this a father being 'serviced' by his adult twin sons? - plus grandson?

I think we'd have been told if it was. Pity - though maybe they wouldn't say - or is it just my own pervy imagination? Even though the 'father' doesn't look quite old enough to be so you have to admit that there's quite an uncanny resemblance between the three older ones. Maybe he's an elder brother? Nice to fantasise about it, ain't it?. 😀