Each household has different usage requirements. If every member of the family likes to stream in 4K then 100 Mbps probably isn’t going to cut it most of the time.  However, if they’re happy with 1080p and average-quality video calls, 100 Mbps will be fine most of the time. If your family has a download speed of 100 Mbps, just make sure that your router signal is strong enough to stretch to every corner of the house and each device.