Need help convincing partner to agree to flu shot for kids

Kids are 4 & 2.5yrs- we've never done the flu shot before. Considering how bad this year's new strain seems to be I really want to get the vaccine this year. My partner is fully against it. We've gotten all other vaccines, but they're fully against the covid & flu ones for the kids. I need all the help I can get with research based evidence that shows the flu shot is safe.

Bonus points if it's easy to read or in Russian as English isn't their first language. Scientific based papers will probably be too long/hard for them, so maybe a summarization or articles that are actually backed by doctors/science.