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>You compare the vaccine to birth control to dismiss the risks of the vaccine

Or I compare it as a reference to a commonly taken medication to contextualize the risk. I also included a comparison to the disease it is vaccinating against, again, to contextualize. It is also worth noting that the absolute risk amounts to about 4 additional cases of VTE per 100,000 people that are vaccinated.

>In the OP’s case his sister was in the low risk category (quite young). So its not obvious that a priori the vaccine outweighed the risks.

Between 12 and 115 children end up hospitalized with covid per 100,000 total child population, not per 100,000 that catch covid (which is 1,900 per 100,000 infected children) [1]. So the risk of catching covid, and having a case severe enough to end up hospitalized, is far higher than your chance of VTE from the vaccination. So I find it odd that you would describe those odds as “low risk” for covid. And yes, its pretty obvious the vaccine outweighs the risk.

[1] https://www.aap.org/en/pages/2019-novel-coronavirus-covid-19...