My father died over 10 years ago and over the last four years my mother has had a partner, but the relationship has been getting rockier and rockier over time.
It looks likely that they'll be splitting up soon (and it has the potential to get quite nasty and take a fair amount of time as there's property/money involved). The thing that worries me the most though is how the dses (ds1 is almost 6 and ds2 is almost 3) will react.
To all intents and purposes, this man is their granddad and I can see the potential for a lot of upset and confusion. As he is a partner and not a biological granddad, it's very unlikely that he'll want to keep in touch with them. Already they're questioning where he is (their grandma visited today on her own which is unheard of from their experiences) and they have no previous experiences of divorce or relationship breakdown anywhere in the family or close friends.
Any advice on how best to explain the situation and handle the inevitable upset is very appreciated.