Jason Kelce was by his dad's side as Ed Kelce said his final goodbyes to his girlfriend on Thursday ... attending Maureen Maguire's memorial service with Kylie Kelce.
Travis Kelce's big brother and sister-in-law made the trip to Gladwyne, Penn. to celebrate the life of Maguire ... who died "peacefully" nearly one week ago.
Jason wore a button-down shirt and tie ... while Kylie opted for a black dress.