I totally get you OP, as a mum of a 2 year old.
I just think you haven't quite worded it properly. Not a childminder, a babysitter perhaps?
At 2 they change SO quickly. They are doing new things every day.
For me, the ideal parenting of such young children would be a co-parenting one, where you can keep in regular contact with the other parent and update them on the new changes and developments in their life.
Skype works fine for a 2 year old. Mine will happily play on camera - and if you interact with him, he interacts back. 10-20 mins of skype every couple of days would be ideal if the child doesn't mind it. It gives that extra connection to the parent who isn't there all the time.
I agree, your sisters ex sounds pretty crap as a parent, but sadly is 'good enough' in that he isn't neglecting the child. He just doesn't actually seem to really care/love I guess.
My eldests dad is rather like this, in that he sees him once a week, picks him up from me at 7.30pm, he goes to his flat, sleeps there, then the next day goes back to dads for the evening, has tea and comes home at bedtime. In between there is no real contact. No contact between me and him except either 'pay maintenance asap please' or if there is a real problem with behaviour. Nothing else.
DS was just turning 7 when we split, by the time he was 8 the above was pretty much the arrangement. Dad doesn't text him or call him, despite him having a mobile from age 9. It's like he has two totally separate lives. I don't doubt he loves him, and wants the best for him. But he just doesn't do what I would think a NRP should to get the best out of their relationship with their child.
I've always made contact easy for him by the way. And he can have more if he wants. It's never been an issue. He chose the contact arrangements with no input from me.
I think it's just him I guess. Probably sees DS as more of a mate than a son. :(
Don't get me started on DS2 and unborn DS3's dad... he's the total waste of space in my life... no contact at all there. And it's better for all that way.
When I did try to engage with him about the two children I got similar responses as your sisters ex. Totally uninterested. Was the same on Skype, kept his gaming headphones on one ear, could hear him tapping away on his laptop, replying to text messages etc. He wasn't interacting with DS to the point where I had to step in and engage him in playing to show dad what had changed, what new things he could do. Didn't tell his son he loved him, just fuck all from him emotionally towards his child really. So I've deleted skype, and now have gone totally no contact. I'm not even making the minimum effort, because he won't.
Need to find better or no men in my life clearly. 