"It's very, very, very difficult time right now," Foster's friend, producer Jodi Gomes, told E! News. "As a mother, I'm devastated for my friend. Tameka is holding up strong. She is very faithful and puts all her trust in the Lord, truly."
Glover was struck in the head by a personal watercraft driver while riding an inner tube on the lake a couple of weeks ago. Police later identified the driver of the watercraft as family friend Jeffrey S. Hubbard.
Neither Usher nor Foster has released a statement regarding Glover's death yet, but Foster did tweet a photo of her son Friday morning.
Following the sad news of Glover's passing, celebs like Russell Simmons, Justin Bieber and more shared their condolences and prayers for the family via Twitter.