How can you be sure they can't hear you? Scripture indicates otherwise. BTW, Catholics don't pray to our parents, either.
"For as the body is one, and hath many members; and all the members of the body, whereas they are many, yet are one body, so also is Christ. For in one Spirit were we all baptized into one body, whether Jews or Gentiles, whether bond or free; and in one Spirit we have all been made to drink. For the body also is not one member, but many. If the foot should say, because I am not the hand, I am not of the body; is it therefore not of the body?"
"Now you are the body of Christ, and members of member."
"Now therefore you are no more strangers and foreigners; but you are fellow citizens with the saints, and the domestics of God, Built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone"
"For I am sure that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, nor might, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord."
"And if one member suffer any thing, all the members suffer with it; or if one member glory, all the members rejoice with it."
Need proof and in context.
So much for praying to Mary.