The request must include evidence that the proposed new resident is a member of their family or, in the case of an exchange, evidence of an agreement between the two sets of residents.
Rhaid i’r cais gynnwys tystiolaeth bod y preswylydd newydd arfaethedig yn aelod o’i deulu neu, yn achos cyfnewid, yn dystiolaeth o gytundeb rhwng y ddwy set o breswylwyr.