Sibling relationships risk long-term damage when parents give some adult children more financial help than others. Those feelings of unfairness can persist into middle age, sometimes erupting into legal disputes over inheritances.

John, 47, says his parents who have long backed his younger brother refused to lend him £10,000 for a house deposit after a breakup, even though they had previously helped that brother buy a home and subsidised his living costs. John, whose real name has been changed, says he was treated as the more academic child and expected to be self-reliant, while his 42-year-old brother was coddled. The pattern has left him feeling isolated and convinced his needs come second, he says, and the strain reaches beyond family ties into friendships and romantic relationships.

A US study cited in the source found about 15% of siblings report conflicts over money, and online forums show recurring complaints about unequal parental support, divisions of inheritance, and perceived imbalances in caregiving for ageing parents. Dr Fenia Christodoulidi of counselling service Relate says disputes are rarely only about cash, because financial help often signals love or recognition. She warns that practical reasons for unequal support, such as illness or lower earnings, can be misread if parents do not explain their decisions.

Some families experience these tensions without long-term rupture. Ellis, 26, who works in finance in London, says different siblings have received varying levels of help at different times and it has not caused problems. By contrast, Tasha, 33 and the youngest of seven, says arguments have flared when relatives perceived favouritism, though she attributes many flare-ups to normal jealousy.

Claire Webb, a solicitor and mediator at Family Solutions Now, regularly handles inheritance and sibling disputes. She says historic acts of support can be dredged up when wills call for equal division, producing feelings of unfairness. Webb recommends parents make their intentions known while alive, and advises families to try mediation before litigation, because most cases that reach legal action still end in an amicable settlement when the underlying issue is addressed.

Experts suggest families recognise the emotional drivers behind money rows, avoid assumptions about others' finances, encourage respectful conversations about expectations, and consider professional counselling or mediation when talks stall. Clear communication and documented intentions by parents can reduce the risk of resentment and costly disputes after they die.