From my grandmother
From = preposition; my = modifier; grandmother = noun.
Under the warm blanket
Under = preposition; the, warm = modifiers; blanket = noun.
In the weedy, overgrown garden
In = preposition; the, weedy, overgrown = modifiers; garden = noun.
Along the busy, six-lane highway
Along = preposition; the, busy, six-lane = modifiers; highway = noun.
Without excessively worrying
Without = preposition; excessively = modifier; worrying = gerund.