"We’re greatly appreciative of the condolences from everyone. We ask that we please be given privacy to grieve our loss of Leo," Robert concluded in his message, obtained by a news publication.
Drena confirmed the loss of her only child in a tearful post shared to her Instagram account on Sunday, July 2, as OK! reported.
"My beautiful sweet angel. I have loved you beyond words or description from the moment I felt you in my belly," the eldest daughter of the Taxi Driver star wrote alongside a close-up photo of Leandro on a red carpet.
"You have been my joy, my heart and all that was ever pure and real in my life. I wish I was with you right now. I wish I was with you. I don’t know how to live without you, but I’ll try to go on and spread the love and light that you so made me feel in getting to be your mama," Drena continued.
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"I’m so sorry @carlosmare 😢💔. Rest in Peace and Eternal Paradise my darling boy 🙏🏽💔💔💔💔💔🕊️🕊️🕊️🕊️," Drena concluded, tagging Leandro's father, artist Carlos Rodriguez.
Rodriguez has yet to speak on the death of his son, however, he uploaded a black screen to his Instagram account just a few hours before Drena broke the news.
Leandro's father did not caption the blank post, but he left his comments section open — which has since been filled with condolences and prayers for the Rodriguez and the De Niro family.
"May god guide him to heaven. Our prayers are with you 🙏. He is your angel 😇. He will be beside you wherever you go 🙏❤️," one social media user expressed, as another added, "Carlos I can’t even put words … here for you my brother ❤️ sending my deepest condolences."
Page Six obtained a statement from Robert's rep about his grandson's passing.