its just hard questions time with my kids

today my 4 year old asked me something i knew was coming. Hes a twin and his twin was lost in the womb when i was still in first trimester. He knows about it and in the pictures on the living room wall of all my kids as newborns theres one more a sonogram picture of him and his twin at my first sonogram. He asked me if one these twins were going to die before birth too. I took him to my bedroom and we set there and I tried to explain the best I could to my son that doesn't always happen and we hope it doesn't happen this time too. Best thing to do is pray