What concerns does the friar have about romeo and juliet's relationship

They are from families who have a bad history with echother

Their families are rival enemies!
And they're getting married?
What will their families do to me if they find out I helped them?
These were probably some of the thing's going through the Friar's head.
Of course he had concerns, he could get in serious trouble!
Hope this helps, and happy studying~!
~{Dunsforhands}

breaks from the blue back skin of the water, dragging her seashell with its mossy scutes

Explanation: