This is a weird one but I'd welcome some advice.
My grandad passed away in 2012, he was a lovely man and I'd made the effort in my 20s to visit as much as I could. Growing up I only saw him a handful of times as we lived at opposite ends of the country and my mum never tried to build a relationship for us.
In his later years my mum did not visit him, even after he bought her a car so she could drive to see him. He was a lovely and generous man. He lived with my aunt and uncle. My mum fell out with them many years prior over inheritance as she wanted my grandad to cash out the inheritance and give it to the grandchildren whilst he was alive - to me, my brother and a cousin, he declined and my mum and uncle never spoke again, until he was in hospital before he passed away.
In 2012 I was away travelling and on my return my mum said there was nothing left of your grandads and that aunty and uncle spent it all. She then started sending me gifts, £250 for a wedding the previous year, £20 for Easter eggs, £40 to go out for pizzas. Thinking now this was out of character (we have never been close) and I wonder if she was asked to pass on my inheritance but never did, but gave me the gifts in lieu.
How do I broach this without a relationship breakdown?