@Educ2022 Thanks for the question!! Congratulations on your new bundle of joy!!
Yes, you can file as a resident alien if you have stayed in the US for more than 5 years. If you both are in your 6th year or later and have met the Substantial Presence Test then all you have to do is apply for the ITIN for your spouse & file a Married filing Joint return. Also, you should apply for the SSN for your child. Your spouse is not your dependent, only your child can be claimed as a dependent on your return.
For the Vehicle purchase, you can enter the registration fees as an itemized deduction. But if the standard deduction is beneficial for you, then it does not apply.
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