adjusting agi strategies after selling inherited home

My sons inherited their mom's home after her death.  They sold it and will have a capital gain.  They are maxing out their 401k's and put 6k into an IRA to reduce their agi's.  They are also paying student loan interest.  We have the comps of her house for date of death value and are adding in improvement costs.  Looks like each son will have a 90,000 dollar capital gain. Are there any other strategies to reduce their cap gains tax bite?

 

Thanks for your time.