You will be fine, @anon80904485.
You will get a separate SMS message from each RCS-group-thread user (such as one of your iPhone-using relatives) who likes a message – say, with a heart icon – in that thread. In contrast, the heart-icon “likes” in an RCS group thread accumulate beneath the single, liked message.
Yes, the SMS experience is effectively wordier, but you WILL get an SMS message for everyone else’s interaction RCS-wise in the thread.