Hi G2023,
Please note that, as joint inheritors of your late mother's home, both you and your brother should declare 50% of the Capital Gains tax profit and deductions
in your own Self Assessment tax returns (on the grounds that the asset was sold for more than 4 times your £12300 CGT allowance).
Because your 50% gain was below the £12300 threshold, there was no requirement to report the transaction within 60 days.
Report and pay your Capital Gains Tax
Thank you.