Here is what I would try first to see if it works for you + do not forgot that you will now be paying more for internet only service (vs being part of a bundle)
$0.00 - over the air HDTV via antenna for all of your locals (and more)
$11.99 - Netflix Premium Plan (4K + 4 screens at a time)
$11.99 - Hulu (no commercials - so worth the extra $4)
$8.25 - Amazon Prime (Streaming, Books, Music, Shopping etc . . .)
+ internet plan $?
+ one of your sets of parents probably has a full boat cable plan that can you use for all of the streaming apps that the the networks, cable channels, ESPN, Fox Sports etc. have (check the set top boxes to see what apps they support before you buy one).
I am sure your parents are over at your house all the time and want to watch their favorite shows while they visit
+ you can provide them with one of your 4 Netflix screens in exchange if they need some incentive
If you find that does not work for you then you can try adding the different streaming cable packages that are out there, try one each month as most/all (?) are month to month: SlingTV, HuluTV, Playstation Vue (no Playstation required) and whatever else is out there.