Okay kiddo, so the Patronage of the Blessed Virgin Mary is when we ask Mary, who is the mother of Jesus, to help and protect us. It's like when you ask your mom or dad for help when you have a problem or need something.
Mary is special because she is Jesus' mom and she loves us like her own children. We believe that she can talk to Jesus for us and ask him to help us too.
Some people even have a special devotion to Mary, which means they pray to her and ask for her intercession. They might even have a special statue or image of Mary in their home or church.
So, in short, the Patronage of the Blessed Virgin Mary is when we ask Mary to be our friend and protector, just like we would ask our own mom or dad for help.