I was raised LDS in the late 50s/60s , but didn't know what the belief was. It was Mormon missionaries that visited our home that told me about God and His spirit wife, and that we were all spirit babies and the reason we cam to earth was to get bodies. And getting married in the temple for time and eternity means that you are married in the hereafter, and you can become a god and goddess and have your own planet. When I asked them how the spirit babies were made, they replied, "How do you think" I was outta there after that. God does not have a wife.
Thank you for the context of your questions/statements. As I said, that quote is very very seldom brought up in actual LDS Christian discourse. Anti folks totally love it though! I'm going to break my response up here into the different sub-topics ---
"Spirit babies": I feel that this could use some clarification. LDS Christians believe Jeremiah 1:5 literally: God literally know you before you (and everyone else) was made in your mother's womb. It is believed that each person's spirit lived with the Father before being born on this Earth. I personally have a newborn son, and I see the vibrant personality he has, and firmly believe his spirit is more than 12 months old.
A disciple of Christ's fate: is to become a joint-heir with Him, inheriting all that the Father has. The big things here are sharing His love, mercy, justice, will, etc. Far less important is the size you your "mansion". When people talk about "getting planets" they really are missing the mark on what's important here. Spending eternity with God & your family isn't about playing a harp 24/7 or "look I can make a mountain jump!" or "look how fancy my house is!".
Heavenly Father & Heavenly Mother: yes, LDS Christians believe that Heavenly Father is eternal and male. It would be grossly inappropriate to say "she" or "it" when referring the to the Father as if gender didn't matter. He is our Father & He is male. Yes, it is believed that He has a wife, Heavenly Mother -- male + female together. Heavenly Mother is another topic that not much is known about, and hence it's not talked about much. And no, they don't go making a bunch of "spirit babies via sex", that anti claim is beyond silly.