What are my rights please?

Can you please give me some advice ? My husband passed away a few months ago and I received a lump sum instead of a pension from the army. For personal reasons we were never in a position to treat our kids and always said we would do so if anyone of us passed away. I have drawn cash out and also made a couple of bank transfers to my sons and family and also my husband's parents who are having a tough time at the moment. I have had a letter from DWP saying that they need bank statements and receipts for any money I have spent over £250 from this money. They also said that my benefits could be stopped if I had given the money away!! Without going into personal details my husband had a hard time and we made wills with the fact that we would share any money, however I can only find mine. I have got nothing to hide but if I am not sure what I need to do. Thanks for reading.

Thank you for your comments. I am on ESA and PIP. I can prove where the money has gone, would I be better getting a letter off my family to say they received the money? I am just unsure what to do.

thanks

£16,300. But my husband had problems and we owed family who had continually bailed me out of situations. I paid back what I could and also helped my kids.