I am feeling pressured by my inlaws..?

My son will be a month old tomorrow (we count from the 20th to the 20th is one month). My husbands father and mother are nit together and remarried. When we had our baby shower we had to have three because his father did nit want to go to any of the other baby shower they wanted their own and my family was helping my older brother move out of city on the day we set the shower for so we had one for each my family, his dads, then his moms which was okay but tiring. :back info-His step mother had a son prior to being with my husbands father whom is 30 and never had a job. He had sex with women exactly like him made a child couldn't take care of it so my husbands father and step mother adopted the child. They don't really care to teach him manors and just give him ADD medicine. So this child runs around screaming, licking people, throwing little animals in the air, etc.: Then at the shower for his dads his step mother decided it was appropriate to say "You better take care of him! Just remember we took Damian!" that kind of put me on edge a bit because first it was our baby shower, second Josh isn't even her child, third why would she assume we would not take care of our child? It was a planned pregnancy and they knew that. Now I am breastfeeding our son exclusively. I don't even want to give him a pacifier yet because I want to succeed at breastfeeding. Now his father and step mother came over to see him and when I was inthe other room feeding him his step mother said she wanted to ask me why I will not pump because she wanted to feed him so I didn't have to take him every hour to feed him and when she holds him and he starts givig cues that he is hungry I say I need to feed him and she waits until he starts screaming to give him to me so when ido go feed him he is so frustrated that he won't latch on. On top of that they are trying to pressure us to go with then to Iowa when he will be four months driving all the way from Texas because she won't fly.