Lara Spencer had the best time growing up in a large family, and is one of five children.The Good Morning America star took to Instagram at the beginning of the week to share a sweet snapshot of herself with her four siblings and mother, as she marked National Sibling Day.MORE: GMA's Lara Spencer shares incredible beach photo with husbandAlongside a picture of the family lined up with their arms around each other, Lara wrote: "I love my 4 sibs! (and the cutest mom in the world – a vision in