Btdt
Vinegar and boiling water don't help. They might make a few weeds brown but kill them all, no. The ones it does kill you still need to pull.
First you need to get the weeds pulled out. Do it yourself or hire someone. Once that's done, then you need to apply the long lasting round up formula. Do 2 applications a couple weeks apart but not when you suspect heavy rains.
Next year, around march, be proactive and get the long last round up stuff. A good covering of it early in the season will prevent big weeds.
The only true way to stop it without chemicals. Get the weeds out at the root and that can mean removing bricks to do so. Labor and time intensive.
A lot of weeds are resistant to roundup. Boiling water, heat gun or propane weed flames work better. If weeds are big, you have to use a large container of boiling water. Pulling will destory your patio over time.