My Dad is Wilbert Shoemaker

I`m looking for a half sister. I was just told yesterday that Dad had a daughter by another woman. Not sure if she was adopted or not. She had called my brother and he hung up on her without knowing her name. My sister and I would love to meet her. I`m so sorry my grumpy brother was so rude. He Mom met my Dad when he worked at Campbells concrete company in Maryland. Would love any information possible. We`re not young girls so time is very important.