A bereaved mother has opened up about her brother's 'cruel and selfish act' after the death of her toddler.

Explaining the heartbreaking , the mum shared that she had recently lost her three-year-old son from a "chronic condition he was born with".

"I struggled a lot with his illness and received a lot of support from my family when my ex-husband was too busy with work than care for his son," she wrote.

After his death, the grieving mum decided to lend all the items of $4,000 in value to his brother and her wife as they were expecting a baby - under the proviso they return it all when no longer needed.

"It's an expensive nursery and the process of shipping (I live in another country) took me time and money and of course not to mention it's sentimental value," the mum explained.

Sadly, the couple suffered a miscarriage.

"They were so grateful for my help and appreciated it a lot but my sister-in-law unfortunately, lost her baby at five-months in the pregnancy," the mum revealed, adding that the couple wanted time to grieve alone afterwards.

The sister waited a few months before calling her brother to ask for the nursery items to be returned, only to be floored by his response.

"Despite how cruel I sounded, I just had to get it back," she explained, "I was shocked after my brother said they sold it, all of it, every single piece."

"I asked why and he said his wife was depressed and he needed money to take her a month ago. I lost my temper and started screaming at him on the phone reminding him that this belonged to my son and only for them to borrow not sell," the upset mum continued.

While the brother then apologised for his actions he also called on his sister to be "understanding of his wife's position as a grieving mother myself."

Unfortunately, things escalated, with the grieving mother screaming and feeling devastated that her son's possessions had been sold without her permission.

"He replied that he didn't think I was being fair to scream at him for wanting to help his wife through these hard times," the mum said.

"I told him that is not my problem and that I will be suing them both over the nursery and for every penny he made out of selling it."

The brother then got the entire family involved, and the grieving mum was branded "callous and unhinged" by her parents for threatening to take her brother and sister-in-law to court.

"They told me to let it go.. and it's and it's not worth causing permanent damage in my relationship with my brother over 'few pieces of furniture'."

The upset mum then asked Redditers for advice, to gauge whether she was over-reacting.

The community immediately chimed in with support for the mum, condemning the couple's 'cruel and selfish' act.

"It was so unbelievably cruel and selfish for them to sell mementos of your son for a vacation," wrote one. "You lending them the nursery for free represents how highly you regarded them and how you very kindly hoped that they would honor your son's memory by bringing up their own child with his nursery. Sue their pants off!"

"I can't even believe the audacity of the brother and SIL," added another. A grieving mother should understand why the nursery would be important to another grieving mother (OP). I had four miscarriages and four years of fertility treatments. Vacations really did help, because it let me escape the treatments and reminders and it gave me something to look forward to. We took a lot of trips when we could afford to WITHOUT selling other people's s--t".

"They knew they were wrong, otherwise they would have asked you before selling it. They were willing to deal with the fallout from selling it to get what they wanted, so show them the fallout," commented a third.

"Sue them OP. They are selfish selfish people. With no regard for their family. I can't believe they disrespected their nephew's memory for a holiday."

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