Most Helpful Guy
Most Helpful Girl
No problem in Keeping This In the family here, dear. There is No blood right now, No guarantee even that Neither mom nor you will be Doing the Dirty down the love line in Time, so don't give it a thought right now.
I have heard of couples who have Married and step brothers and sisters who have gotten together as two birds of a feather in the same nest.
For now, Keep a low profile and silence is the golden egg until you see if it is worth opening your Mouth just in case it Goes... South.
Good luck. xx0