Which sentence for "Believing New Things"

I started the “Believing New Things” module in the Study Vault.  I’m having trouble choosing my exact sentence.  I actually have two things I would like to believe and I’m having trouble knowing if I can have two?
My husband is leaving me and this is a very difficult time for me and the family.  My sentence would be “I will be happy and fulfilled without him, and my children will be happy too”.  But can I put my children in it?  If I only have to choose one, then priority is given to them, so my sentence would be “My children will be happy in this new family configuration”.
Another question: should I put it in the present tense?  At the moment obviously it seems difficult to me…thank you for helping me to see things clearly!