The Catholics I came across all denied that they prayed to Mary. But merely asking her to pray for them, in other words, intercede. But from the evidence of their rosaries, statues, pictures and altars for some cases, even the songs or prayers(forgot the names of the prayers, but they should be goggle-able), all points to them praying to Mary instead. Not sure if saints are treated the same way, maybe to a lesser degree compared to Mary.
Anyway, the bible is very clear on who should be our sole object of worship and prayer. As John 14:6 clearly says, “Jesus told him, “I am the way, the truth, and the life. NO ONE can come to the Father except through me.”
And in verse 14 of the same book, Jesus further states, “Yes, ask me for anything in my name, and I will do it!” And Rom 8:34 “Who is he who condemns? It is Christ who died, and furthermore is also risen, who is even at the right hand of God, who also makes intercession for us.” Only His name was given power and authority over everything (Eph 1:20-23).
So it is only biblical to pray to Jesus who is our intercessor, who is given the only authority to make appeals to the Father on behalf of us. No where in the bible was any sort of authority given unto Mary.
But we honor Mary, as a woman of faith, who surrendered her womb to God’s will for the birth of our Messiah. And Jesus did beckon to John to “Behold your mother!” in John 19:27, meaning Jesus cared about her and honored her, and called John to honor her as his own mother and him as her own son. But it wasn’t a statement bestowing divine status to Mary, that will be really over-stretching the interpretation, and we don’t find John attributing any authority or power to Mary, nor did he even elevate her beyond her mortal status.
However, from my personal experiences in having dialogues with Catholics, and praise God, 2 of the many did manage to turn away from the practices, are baptized and are now active members of my church, that it is wiser not to engage them via this avenue(arguing about Mary) if possible.
I usually focus on exposition of the bible and found that many of them are not too well-versed with the bible. They have always just focused on the ritualities and tradition as told by their parents. And opening the bible is like opening their eyes for the first time.
I hope and pray that the authority and power of Jesus is upon you as you minister to Your family.
Blessings in Christ,