Baby Mama Drama!! What do I do?

My husband has a 4 yr old back home in florida that his baby momma just approached him with three months ago. He claims he knew there was a chance he could have gotten her preg, but they broke up a month after they had sex. So he never knew of a baby. When she called him and said they had a 4 yr old son, I was excited becuz I have had a hard itme having kids, and i LOVE children. Off top she was going off on him about seeing his son. So b4 his trip there I bought the kids sum cool stuff and made like a big a5s gift basket. At the last minute he asked me to tag along. So i did, we got htere and i got a hotel room, and rented a car. I never disrespected her by showing my face. He decided to bring Jr back to memphis with us for a month. We have been home two weeks with the lil guy. Ive taught him to call me by my first name, even tho i am his step mom. She calls OUR house daliy cursing me out. Sayin don't touch her son, dont feed him I may try to poisen him becuz Im jealous that she has >
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I commend you on being yourself and remaining professional. When she starts going off, don't pay her any attention. If it makes you upset, just pull the phone away from your ear. Sadly, you can't change her ghetto behavior. So remain the classy lady you are. Have you asked her why is she so upset with you? Suggest to your husband to not go off on her. Just tell him, to take the phone from his ear and let her act like a fool. She is probably jealous of you because of the way you handle yourself and you are married to her child's father. Children are smart and I am pretty sure, your son would rather be with you all instead of her because no telling what she is saying to him. Keep loving the child and being a positive influence in his life. Believe me when she starts talking a lot of crazy talk the child about you all, he (the child) will see that she is lying and she will lose out. Continue to be strong and professional. She will eventually get tired and may see how foolish she act and look.Whatever you do, don't stoop down to her level though I realize it's hard not curse her out.
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