I'm growing moon flower vines too! I bought mine at Lowe's or Wal Mart I think. I planted them around the base of the power poles and I can't wait to see how high they go. This is my first year growing them.
I'm sorry about your son Chris. This really must be a hard month for you. Luckily May is a busy time in the garden so you should have plenty of work to distract you. Being outside, surrounded by nature, is the best balm to a grieving soul that I can think of. Good luck with the moon flowers!
Jennifer