Signing a financial assistance form for someone I haven't lived with in a long time?

My ex boyfriend's dad just texted me and was like, we're trying to get assistance for our house, and we'd get extra money if you signed the form.
However I haven't lived there in 2 months and I've already done a change of adress. On top of this, I only lived with them for 2 months.
Is it right of him to ask me this?
 
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