You explain an issue when you are asked a question.
You apparently are not being asked a question. At that point, you are either trying to tell them what they either don’t want to hear or are not interested in, or if you keep pursuing it, you are arguing with them.
They are adults. They already have an opinion on the matter.
You are not an adult.
And by continuing to pursue this issue, you most likely will make them mad - which is not going to accomplish anything positive.
If your whole family is Catholic, then that should mean your parents are Catholic. If they don’t go to Mass, then there is a reason; and if they have not told you, it is likely they will not tell you no matter what anyone here says. They have made their choice; now you need to let it alone. they have not asked you a question about going to Mass, so it is farily clear they are not going to go.
You need to go to Mass, and leave the issue alone. They can see what you are doing, and that is far more likely to get them to start thinking in that direction, than anything you could tell them.