Yes. While it’s not the usual situation that someone in a younger generation gives gifts to someone in the older generation, there’s no tax rule barring this. In fact, under tax law there’s no bar to gifts being made by minors.
Depreciation methods that allow faster write-offs than straight-line rates in the earlier periods of the useful life of an asset. For example, in the first few years of recovery, MACRS allows a 200% double declining balance write-off, twice the straight-line rate.