Grandad issues - please help!

[Candycats]

Sorry in advance for the long one! I've just gone back to work (1 full day and 2 half days) after maternity leave, DS is almost 10 months. My dad is looking after him while I'm at work, which I'm incredibly grateful for as obviously saves us a lot of money and DS loves him. However, I'm now beginning to question if he's the right person to be looking after him. He plays for hours on end with him and follows the rules that I've set regarding looking after DS; however, he can be such an aggressive person and sometimes talks to people in a disgusting way if they annoy him (swearing etc). He has never (and I'm sure will never) been like this with DS and obviously I've grown up to be (hopefully!) a decent person despite it, but I don't want DS growing up thinking that it's okay to treat people in the way he does. I want his role models to be kind, calm people and although my dad is like that with DS, he isn't always with other people he interacts with. I feel so torn as to what to do as they get on so well and he really does look after him well but I just worry about the impact he could have on DS as he gets older and starts to understand things better. Would appreciate everyone else's thoughts on this please xx

He’s going to see this side of his grandad anyway. So you are going to have to deal with it, whether he provides childcare or not. How ARE you going to deal with it? Once you figure that out, you can decide whether it will be enough to counter unsupervised time.
It’s not like he is a paid childcare that ds won’t see if you decide to pay someone else. He’s going to be part of his life and ds will absolutely see how he treats people.
So really, the question is, how can I show ds that the way my dad treats people is wrong, in an age appropriate way?

@nachthexe very good point, thank you. I suppose as he grows up we'll just have to teach him that his behaviour is wrong and set an example of how to treat people - as you say it's just finding age appropriate ways of doing that

Grandad looks after my dd too, he does things I don't like much- encourages her jumping all over him and therefore everyone, too much junk food and LOVES the attention so they spend hours bothering the staff at the supermarket, soft play, playgroup, library etc. I suck it up but I'd worry with your dad being aggressive and out for a row that he'd bump into the wrong person and it'd escalate on their part. We hear over and over about one punch killers after a row, road rage incidents that go badly wrong and the like. Although one that sticks out in my mind is the poor husband and father who was stabbed in the heart with a screwdriver for accidentally bumping into a monster. So things can happen, I'd just prefer it if the person looking after my kid tried to calm their boots whilst in loco parentis!