Even though the numbers are different, I know something about this.  My daughter-in-law is 10 years older than my son and used to work for me.  (That’s where she met him when he volunteered to help me, I had no clue).  When William finally came clean on both, I had to take a huge step back.  Not going into the backstory here, but I kept a close eye and didn’t say anything.  I always prayed that G_D would let him be happy and for me to support him.  G_D answered that prayer.  I have two beautiful grandchildren.  I know two totally different scenarios, but I know somewhat how you feel.