PMing other members of this site asking for money is UNACCEPTABLE and will not be tollerated under any circumstances, especially if it seems like you are targeting someone who seems to be especially kind and maybe a little old. That is low.
If you do this, you will be classified as a scammer and your account deleted. So don't ask. I don't care what the reasons given are.
If someone offers money then fine although I'd warn anyone against falling for sob-stories they read on the internet. By all means, help anyone you know personally who is in need but do risk not throwing your money away.