Tom Bradyand Rob Gronkowski were very much in synch in Sunday’s win over the Bills. (Gronk had five catches, including a terrific one-handed TD grab.) But, judging from their social media accounts, the pair spent Christmas Day differently. While Brady and his bride, Gisele Bundchen, took a snowy stroll near their Chestnut Hill home, Gronk opened presents with his mother, Diane Walters — “Boxers, XxxL Socks & Toothbrushes! What more can ya ask for! Thanks Momma,” he wrote on Instagram — and then sat courtside with her at the Celtics game.