looking for siblings who were removed from parents care in early 70's

Please give us more information. female or male. What city?

One was a boy the other a girl. They were removed from our parents care in 1972 or 73. I was born October of 73 and they were removed befor I was born. The girl was 2 at the time of mu birth and the boy i think was around 3. I am not sure of the state or City. My last name at birth was Martin I am assuming that was the last name of my siblings because our parents were married.I was born in Sioux City Iowa however my siblings were removed in another state. I know that my sister had blonde hair, blue eyes, and had dimples. She was adopted by a family in thier mid 30's and had 2 biological boys. My brother was adopted by a family in thier mid 30's also and they had no other children at the time of his adoption. He had brown hair, blue eyes, and had a fair skin. Our birthmom was also adopted.