Explanation: The letter of proof from parents means that the applicant needs to be transferred back to his hometown to go through the relevant formalities when working or studying in other places, and parents need to provide proof materials to prove the relationship between the applicant and himself. According to the regulations, the parents' certification materials of the transfer letter must be signed and sealed by the parents themselves, but it is not stipulated that they must be handwritten or printed. Therefore, the proof materials of the parents of the transfer letter can be handwritten or printed.

Practical solutions and countermeasures: when dealing with the parents' proof materials of the transfer letter, you can choose to write or print it yourself according to the situation. If the applicant needs to go through the relevant formalities urgently, he can choose to print, which can save time. If the applicant has enough time, he can choose to write by hand, which is more authentic and sincere. Whether handwritten or printed, parents' signatures and official seals are necessary.

Extended description: If you need to print the parents' proof materials of the transfer letter, it is recommended to choose regular paper and printer for printing to ensure the quality and beauty of the document. At the same time, pay attention to the choice of font and font size when printing, so as not to be too small or too large, which will affect reading. Finally, in order to ensure the authenticity and validity of the certification materials, parents are advised to personally sign and affix their official seals to prove the authenticity and reliability of the documents.