Worried is the simple predicate and both is a simple subject in the sentence "My both parents worried about their families a few miles upstate."
What is a simple predicate?
The simple predicate is the main verb or verb phrase that characterizes the action of the subject in a sentence. A simple predicate only consists of the main verb or verb phrase. There are no modifiers in the sentence. Sometimes a verb phrase will "interrupt" or "come in between" a modifier. In this case, the modifier is not part of the underlying predicate. The fundamental predicate is the verb or verb phrase alone, without any modifiers.
To know more about simple predicate, visit:
https://brainly.com/question/28171238
#SPJ4