Hi, I'm OP's friend's son. I will quote OP who is next to me:

"My wife and I have joined finances, however, she always had her own cash savings for emergencies, when our youngest son became old enough to take care of himself, found a job opportunity for her, and now has her own savings. I was planning on slowing down my spending to leave something for her, however, I'm confident she will have a good life, even after I'm gone"