Tricia Somers enjoys watching her 8-year-old son play with Legos. She knows moments like this could soon be gone, not because her son is growing up, but because she is dying.

Somers, 45, was diagnosed with liver cancer last year. In March, she found out it was terminal. The single mother’s biggest concern was her son and who would take care of him when she died.

“He is the only thing I got and I have to leave him,” she said. “It is really hard and I feel bad that I am doing that to him and he says, ‘Mommy it is not your fault.’ “

Somers’ options were limited. Her parents passed away from cancer years ago, her brother told her he did not see a child in his life, and her ex-husband has not been a constant in Wesley’s life.

She was devastated until a nurse, with the…