I had that problem but with other members of the family !
Son and I went away on holiday for 2 weeks - it was 7 months after my mother had died unexpectedly - devastated dear father went to stay at my sisters.
Came back after the holiday, second week of which we had spent at a nieces in Cornwall, thinking we'd spend some time with her and her DH and my great niece - only they carried on as if we weren't there, carried on working etc , didn't even go out for a meal together!
Walked in the door of my home, sister, brother, and partners had been through the house, emptied out the cupboards and removed anything they thought had belonged to my mum, anything they weren't sure of had been put in bin bags and dumped in the barn (for us to sort through) . The washing I had done before I left and not taken with us or packed for my dad had all been bundled up and dumped on my bed, along with other personal paperwork and belongings, same for my son! The garden had been attacked with a hedge trimmer from one end to the other so several plants and shrubs that I had spent a lot of money on, or were chosen by my mum died. My father took one look at the devastation and said right up until he passed away that it felt like we had been burgled. He knew where all his private papers were in a cupboard next to where he sat, not after this time. We even had to apply for replacement bank cards for him as we never did find them ! You can guess it took me several years to even speak to my SiL who was the instigator. Just felt like I was being ganged up against - and then they complained that my house was untidy !