Your son is having a dry patch, everyone does, so don’t panic.
Talk to him about Jesus being his best friend and Mary being his Mother. Ask him how he thinks you would feel if he didn’t talk to you, his mother on earth? Ask him how he thinks Jesus might feel if your son stopped thinking of and talking to Jesus? Ask him how he would feel if his best friend and his mother didn’t speak to him.
Let him think about that and let him start to pray by himself and/or with you in any way
he feels comfortable with. Put the Rosary aside for a little while because the most important thing is that your son prays, not what or how he prays.
Encourage your son to tell Jesus and Mary all that is on his mind. Even to tell Jesus that he finds the Rosary boring, explain Jesus understands that and Jesus loves him. Explain that Jesus’ knows His struggles in every part of his life and is always there to help him. Explain everyone struggles with prayer and that it is only ever important to just make time to say a little prayer everyday. If you feel able explain in terms he will understand the struggles that you have experienced in prayer so that he realises there is nothing ‘bad’ about him. It would be wrong for your son to feel a failure.
You must be very gentle and not force your son, you must respect his soul and how Jesus may be leading his soul towards union with Him.
The Rosary is a prayer of the Church, granted, but it is also a devotion and as such is a personal devotion. You obviously love the Rosary and you can be sure that in later years your love of the Rosary will have an influence on your son for the rest of his life, but for the moment you must allow your son to explore his own spirituality, you must simply encourage him to pray, even if it is just once a day and is only a few words.
Gently explain to your son that Jesus loves him always and is with him always. Tell your son you are proud of him and how much you love him too.
You pray the Rosary for your son and do it by yourself and pray to your son’s Guardian Angel.
Everything will be alright, have faith in that, your son and Jesus
’No-one can take My children out of My hands’
In my prayers.