Question

I said to my parents ,, let us go to a picnic

Answer 1

Answer:

I proposed my parents that we should go to a picnic.....

this is your answer

Answer 2

Answer: I requested/suggested my parents that we should go for a picnic.

Explanation-

Although you haven't mentioned the complete question it seems you wanna change direct to indirect speech.

Remember the format : Direct to Indirect - imperative sentence, would or should is used and we becomes they .

Hope it helps.

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