can you reclaim dna beside tears?

I was at a funeral and realize that I may want to save my DNA for my relatives of following generation for medical purposes. Sure you can.
yes you can because its from your own body you can also you can use your saiva.
Yes you can. people enjoy actually solved murders by getting DNA from tears.
Cheek cell do better. Use a Qtip and rub the inner part of your cheek. Then place it within an envelope and place it in your freezer. A piece of tresses will also work, but you have to attain the root to obtain the mitochondria