Tnx for your response jackolantern. I think we met the criteria for HOH since we both have qualifying dependence and living separately. Is it wise to pursue citizenship right now or shod I wait it out?
According to IRS pub 501,
the following is the definition of HOH:
"Head of Household
You may be able to file as head of household if you meet
all the following requirements.
*You are unmarried or “considered unmarried” on the last day of the year.
*You paid more than half the cost of keeping up a home for the year.
*A “qualifying person” lived with you in the home for more than half the year (except for temporary absences, such as school). However, if the “qualifying person” is your dependent parent, he or she does not have to live with you. See Special rule for parent , later, under Qualifying Person."
See
http://www.irs.gov/publications/p501/ar02.html#en_US_2010_publink1000220775
If you satisfy all of these criteria, then you did qualify as HOH.
From your first post it sounds like you'll be applying for naturalization based on being an LPR for 5 years (rather than on being a U.S. citizen for 3 years).
For 5-year based N-400 cases, providing tax return transcripts is generally not required, unless you had some extended trips abroad and there is a potential issue regarding the continuous residency. So, if you do not have any long trips abroad during the last 5 years, providing tax return transcripts is not required and you will not be asked for them.