First, don't check "Yes" for "Lived in another state?". You didn't change your state of residence by staying with extended family in TX (no matter how long) and then "moving back home" to Washington State. Your state of residence was WA for all of 2016.
What makes you
a resident of a state (or country)?
Generally, you're a resident of a state (or
country) if you intend to either stay there permanently, or return
there after a temporary absence. It's where home is – where you come
back to after being away on vacation, business trip, overseas or
out-of-state employment, or school. Many factors are considered, not
the least of which are where you are registered to vote, own homestead property
and are licensed to drive.
