Oh no, I have to go and setup my family's emails again. We have a domain and I used to forward to some gmail accounts (few don't want to use multiple email programs/accounts), but so much mail got lost (not even in spam folder) that I just had to switch everyone to pop3 fetch to gmail.com. Now at least email get's there, even if it's 30-60mins late (really annoying for logins/verifications/etc.).
Maybe it's time to switch everyone out of gmail and make gmail forward the email to out hosted accounts.
I've been using mail forwarding with my cloudflare domains without issue in gmail since google domains sold... you may want to consider that, delivery has been very good. As another alternative, if you self-host an MTA, you can relay through SendGrid, which also has had really good outbound deliverability, I've used this for a hobby site/app that has a built in MTA.
Maybe it's time to switch everyone out of gmail and make gmail forward the email to out hosted accounts.