My parents - Indian passport holders - are planning to travel to the Czech Republic in May. My dad has a Polish Schengen visa issued for a work trip to Poland and will be using this visa. My mother is going to apply for a Czech visa. As my mom is applying alone, my dad is sending a statement with her application, stating that he is financially supporting the trip and that he has a valid visa. As it is a Poland-issued visa, does he need to explain why he has a Polish visa and how he got it?