Tragic news for Trent Williams‘ family – the San Francisco 49ers star’s wife just announced that their son was stillborn last month … after losing his twin sibling early in the pregnancy.

Sondra — who has three daughters with Williams — announced the heartbreaking loss on Instagram with a heartfelt video showing her pregnancy journey through birth Trenton O’Brien Williams Jr. on November 24th

“My firstborn and only son, I always wanted you, but God wanted and needed you more,” Sondra said … adding that Trenton – who weighed 4 pounds, 8 ounces – was diagnosed with Trisomy 13, also known as Patau- Syndrome.

“I can’t describe how I felt leaving the hospital without you,” Sondra continued. “And also what it feels like to celebrate Thanksgiving at home without my baby in my arms. My heart is broken and my arms are empty.💔 But I know that you will always be close to me and your sisters. 💞👼🏽 And for that, my heart smiles with gratitude.

Sondra went on to explain that the family was also dealing with the loss of Trenton’s twin sibling, who died early in the pregnancy.

“Thank God for letting us bond for 35 weeks and for giving birth to you so I could hold you in my arms. I am at peace and know that you will never have to suffer,” Sondra said.

“Although I will never hear your soft coos and cries or see those beautiful little eyes looking up at me, I am grateful to God for the time I spent with you.”