Karmas are based of all events of life. To say to sai being his son/daughter/devotee and prove worth of that is two different things, To ask something with doubt in mind only brings more doubts and stop miracles happen in anyone's life. People speak bad about lord Rama, Krishna and about great saints too, Then what to say about ordinary people, But is it make any difference?
Sai love to see his children strong, very strong, able to face any situation of life hapily accepting that part of life, living shardha and saburi!
May Sai Bless You!
om sri sai ram!