Every so often throughout pregnancy my exdp would accuse me of tampering with contraception. We were using condoms.
One one occasion after a huge fall out, I text his dad/brother to say it was causing me huge stress that he kept doing this and that we’d used a physical barrier which he had opened.
I never heard back from them and didn’t necessarily expect to. But I wonder if it’s why they’ve had no interest ever in their grandchild… feel shit about it often.