I assume you have a working VCR. I was in the same predicament as you and my VCR croaked it on the first tape. I was pressed for time, knowing that capture devices in stores are a mixed bag, so ended up buying a combo VCR DVD recorder. This was about 5-6 years ago and I had to ingest about 20 tapes. This machine made light work of transferring everything without tying up my Mac. I then copied the dvdmedia files to the Mac. As I’ve needed them, I have used handbrake to convert, otherwise I just watch the files in DVD player.
A side benefit is that you get the DVDs as a backup. Some non technical members of your family might appreciate them too, because you won’t need them once you have the dvdmedia files on your Mac and backed up.
If had to do it today I would pay someone to convert the tapes to DVD. I want to be in charge of transcoding so that I don’t end up with some wacko windows format. Probably less likely in 2019 than 2011 or whenever I undertook this project.