(KRON) — The biological mother of San Francisco 49ers quarterback Colin Kaepernick is tweeting her opinion about her birth son’s national anthem controversy.

Heidi Russo tweeted multiple times over the last couple days against Kaepernick sitting during the national anthem during preseason games.

Here are some of them:

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But many Twitter users immediately criticized Russo giving up Kaepernick for adoption.

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Russo responded back.

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The current relationship between Kaepernick and Russo is not known.