Miniature pinscher 5 years old

Piper is five years old, pure breed miniature pinscher. Piper has never been breed or had a litter. I have had her since birth and I love her so much but as we all know, min pins love to get rough around the everyday play of young children and I have a one year old grandson and a granddaughter on the way. Piper really is a lovable amazing dog, she sleeps with me in bed every night and greets me at the door when I come home. Piper has been through training programs and acts on command. It’s the normal nipping that she does on my grandson that worries me. She is perfect for a couple or a family with older children. She really does love kids she just does not understand going to rough. She is approximately 8 pounds