H will not know who told you. S3 could have. It DOES NOT MATTER. The thing that matters is that when you are AWARE of irresponsible behavior, YOU BRING IT TO LIGHT in a non blaming way. You give H the two choices. One to continue the irresponsible behavior with natural consequences FOR HIM. The other GOOD choice that a more responsible person would choose.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712