The following is a simple writing template to prove the relationship between blood donors and blood donors:

1, reference: XXX (blood donors/blood donors' relatives)

2. Proof: I am a relative of blood donor XXX/ blood donor XXX, and I donated blood to XXX (blood donor) on XX, XX. I hereby provide XXX (blood donor) with the following blood donation certificate:

3. Date of blood donation: XXXXX, XX, XX, XX;

4. Blood donation location: XXXX；; ;

5. Blood donation type: XXX type;

6. Blood donation: XXX ml;

7. Identity certificate of blood donor: the identity certificate provided by the blood donor, including ID card/passport and other documents of the blood donor;

8. Identity certificate of blood donor: the identity certificate provided by the blood donor, including ID card/passport and other documents of the blood donor;

9. Other blood test certificates: According to the regulations of the blood donation center, our blood will be tested and blood test certificates can be provided if necessary.

10, the above proof is true and effective, and I hope it will be helpful for XXX (blood users) to use blood.

1 1. Witness's signature: _ _ _ _ _ _ _ Date: XXXX XX.