Few questions:
1. When does one became a step-parent? if you're dating someone with a kid(s) and the relationship is in a 8 month - 1. 5 year time frame, is that s/o a step-parent?
Does marriage make one become a step-parent?
2. If the s/o (step-parent) moves in with you, (in your spot), yall split the bills or you pay 60% of the bills, the mortgage or lease is still in your name, the biological parent is away and still somewhat parenting from his/her place. To answer the questions that the OP has posted.
What if the biological parent has said 18 years old to start dating, but the step-parent says otherwise,
Punishment for his kid(s) should be no TV, but the step-parent says otherwise, the step-parent (she or he) doesn't think getting C's and getting D's in school on the child's report card shouldn't be grounds for punishment because they got them shits.
The step-parent says the child's curfew can be 12 midnight but the biological parent wants the curfew to be 10 - 10:30 p.m.
Remember the step-parent or the s/o that you are seeing is living with you and putting groceries in the house.
What's the solution when the biological parent is like "that's not his/her home, he or she is living under you" and you are letting them make decisions for my child