They can. Older marriage certificates and foreign birth certificates are also vulnerable, and replacements come from civil registries rather than from schools. Check their condition at the same time as the diploma so that retrieval for the whole household runs in parallel.
Audit the household's civil documents together
TD eligibility rests on the relationship: a spouse, or an unmarried child under 21. The proving documents are civil records, and a faded or damaged certificate creates the same problem as a damaged diploma, only with a different issuing authority. Registries have their own request procedures and their own processing paths. Handling all retrieval in one pass avoids discovering a second gap once the principal's file is otherwise ready.
If a spouse or another household member holds equity in the same company, list those holdings alongside the applicant's so counsel can assess the combined picture rather than each grant in isolation. If the conversion requires a new application for the principal, dependents may need corresponding steps rather than continuing untouched. Make a separate entry for every household member’s intended activity, travel date, and age. TD dependants may study but cannot work, so the spouse should decide whether planned U.S. employment requires an independent status.