The only proof I need is in my patriarchal blessing. If you're not LDS then this won't hold any proof for you, but as members of the church it should be more than enough. Patriarchal blessings are definitely not considered offical church doctrine, but I guess you could consider it a testimony builder on this particular subject.
My patriarchal blessing tells me that before coming to Earth I had a very special relationship with my Mother in Heaven and she is anxiously awaiting my return.
That's the only proof I need.
