OP, to me saving money towards 7 year olds first car is a very dubious priority at best.
OP, it's unclear if you think Dad is willfully underemployed or in a position to have significant unreported income or what ..but if Dad is providing less support than one might expect , why are you not making sure Dad is contributing the share expected of him and or researching his true income ?
Being self employed is not a be all and end all as to not providing medical insurance for ones child ..is Dad picking up cost for things not covered by your plan?
OP, it's unclear if you think Dad is willfully underemployed or in a position to have significant unreported income or what ..but if Dad is providing less support than one might expect , why are you not making sure Dad is contributing the share expected of him and or researching his true income ?
Being self employed is not a be all and end all as to not providing medical insurance for ones child ..is Dad picking up cost for things not covered by your plan?