Transact hopes its new tool will help advisers working on intergenerational planning with clients.
The platform's family view tool has already been taken up by 3 per cent of portfolios and gives clients a "360-degree view of their family's estate over various portfolios".
It lets clients view the portfolios of other family members without having to log into multiple separate accounts.
Tom Dunbar, chief development officer at Transact, said: "Intergenerational planning is a complicated process that is increasingly front of mind for advisers and their customers.
"Having a breadth of functionality, wrappers, and options in an offering is crucial in allowing advisers to support families in effectively planning for the longer term."
Dunbar said the tool was introduced in response to adviser and client feedback.
He added: "We have seen excellent levels of adoption so far. We're looking forward to continuing to advance our intergenerational planning offering to the adviser community moving forward."
In the first two months it was available it was adopted by 7,400 portfolios, equivalent to around 3 per cent.
Access granted to view another portfolio does not allow instructions to be executed on behalf of family members and can be revoked anytime by a client changing the settings within their Transact portfolio.
Transact has seen a 41 per cent increase in logins for clients with Family View set up.
Alongside increasing the visibility across an estate, Transact has recently removed wrapper fees for JISAs and junior pensions for children up to 18 to further support intergenerational planning.
These changes follow the launch of Transact's inheritance tax index, which assesses the number of households that fall within IHT and the overall IHT liability in the UK.
tara.o'connor@ft.com
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