Well apparently Grandad is fantastic and him and DS are now best mates 
They have not seen each other for a year. So we spent a few days there at Christmas. DS is very fussy about food - or has just been bought up badly (according to DF). We have a lot of battles over vegetables.
But when Grandad gave him peas, DS loved them. No battle. He just ate them. No fussing. No pulling a sick face.
So Dad thinks he's a great Grandad who knows how to get children to eat food (apparently treats are a bad thing) and DS adores Grandad.
I have a list of food I would love DS to eat. Little things like fruit, more vegetables, potatoes. So should I just leave him with Grandad for a week and see what happens 