L.C.
Dear K. B,
First, here is a hug for you! You seem like a responsible young lady trying to do the best for yourself and your child. Your sister is less mature than you are and she is not taking responsibility for her life. You are stuck in a classic CO-DEPENDENT relationship. There is a great book called BOUNDARIES by Dr. Henry Cloud and Dr. John Townsend to help you learn about what is yours to control and what isn't. Also as a parent, you are teaching your child by being a role model whenever you use good boundaries or have weak boundaries. Boundaries teaches you that saying "NO" to someone is not the same as being "mean" or "unloving" or "cold-hearted."
You say that you are stuck...but you are not. You have a choice to love yourself enough and respect yourself enough to protect yourself and your child from the influences of a "toxic person." I know that these words may seem harsh but if your sister respected your kindness she would NEVER take advantage of you. Try to look at this objectively. I've had teenage babysitters able to follow my directions to care for my kids better than you describe your sister's ability to care for her child and your child. You have a responsibility to yourself and your child first. Your sister wants to be rescued from her bad choices but it doesn't sound like she wants to learn how to live a successful adult life. You can't force someone to learn and grow and "do the right thing." Your emotions are clouding your sense of reason and I understand that you are worried about your sister's child's welfare but your sister needs to have some of that worry. Once you file for divorce the legal system sets up a parenting agreement and child support and spousal support. Let the attorney do the paperwork to protect the child and if the Bio-Dad violates the agreement your sister has a leg to stand on. When you rescue an irresponsible person they have no motivation to straighten out. This is a wake-up call for your sister. As for you, stay strong, stay grounded, keep on keepin' on and continue to learn and love and grow...your child is depending on you.