Summarising Burdick v. United States, 236 U.S. 79 (1915)
• A pardoned person must introduce the pardon into court proceedings, otherwise the pardon must be disregarded by the court.
• To do this, the pardoned person must accept the pardon. If a pardon is rejected, it cannot be forced upon its subject.
• A pardon carries an "imputation of guilt", and accepting a pardon is "an admission of guilt".
(Library of Congres: Burdick v. United States
So any pardon carries an implicit imputation of guilt.
In Trump’s case, this could only be for criminal acts committed in office and would hamper his plans to run again for president in 2024.
"Under the fundamental rule that no one may be a judge in his own case, the president cannot pardon himself, the Office of Legal Counsel wrote in August 1974. (Full text
Trump has reportedly asked aides about the issue of pardons for members of his own family, although it is not clear what for.
It should be remembered, however, that previous presidents have pardoned relatives (Bill Clinton pardoned his brother Roger), aides, businessmen, and Gerald Ford famously pardoned his predecessor Richard Nixon.