Cleaner Maria Preston was caught on camera stealing over £6,000 in cash and jewellery
Maria Preston, 44, was even filmed checking lottery tickets and reading private letters as she searched for valuable items to seal.
One family grew suspicious when their teenage daughter noticed things missing from her room.
John McNeill and Andrea Smith set up CCTV to capture the cleaner red-handed after a friend alerted them that they also had concerns over Preston.
The horrified parents captured footage showing Preston rooting around in drawers and pockets of clothes.
Speaking after Preston's sentencing Mr Mcneill and Miss Smith said: "Towards the end of 2015 there were a few times we had noticed things were out of place.
"Our teenage daughter would say that she thought she had more money than she had left in her room, little things like not being able to find her lipsticks.
She was even filmed checking lottery tickets and reading private letters
"After contacting the police we set up our own CCTV surveillance at home, in various rooms before Gloria's next visit.
We had footage of her searching through all our personal belongings upstairs and downstairs
John McNeill and Andrea Smith
"We couldn't believe our eyes.
"We had footage of her searching through all our personal belongings upstairs and downstairs.
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"The worst part of all was seeing her stealing money from our daughter's purse and hand bag, even going through her underwear drawers."
John McNeill and Andrea Smith had grown suspicion when their daughter noticed things missing
As well as stealing cash Preston, who also goes by the name Gloria, was also spotted checking lottery tickets which were left around the house for winning number and took sentimental jewellery.
She even went as far as reading private letters as she targeted her clients.
Mr Mcneill and Miss Smith added: "She was also seen stealing cash from other areas of the house, checking lottery tickets for winning numbers, even reading personal letters.
"After checking through the house, we also realised that an antique gold necklace had been stolen, which was a gift from Andrea's parents and held sentimental value.
"We trusted Gloria with the keys to our home, she abused our trust and has shown no remorse for her actions."
Preston was sentenced to two years' imprisonment, suspended for 12 months
Maria Preston had admitted four counts of theft and a hearing was held at Chelmsford Crown Court to establish the correct facts.
The judge found in favour of the prosecution.
He said the witnesses were of good standing, worthy of credit and where their version differed from the defendant's, he accepted the witnesses' evidence.
Preston, 44, of Clacton, Essex was convicted of stealing cash and jewellery totalling £6,180.
The thefts took place at properties between 2014 and early 2016.
She was sentenced to two years' imprisonment, suspended for 12 months, for each of the four charges, to run concurrently.