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McCarthy and Stone, which has a development on Cainscross Road, Stroudwater Court, also wants grandchildren to submit their tips on what they think trendy grandmas and grandpas need to know in the 21st century.

For example, tips on how to play Candy Crush, how to take a selfie, or the words to One Direction’s latest chart-topping hit.

A spokesman for the developer said: “It could be something your own grandparents taught you - an attitude to life, a secret family recipe, or how to get away with cheating at monopoly.

“Maybe you’ve learnt from your gran or grandpa who was a little mischievous and let you spend your days devouring doughnuts, laughing at rude jokes, and staying up late – all away from the watchful eyes of your parents.

“Perhaps they used to slip you some extra pocket money, let you have chocolate cake for breakfast, or tell you secrets you weren’t allowed to tell your mum or dad.”

Once all the suggestions are in, McCarthy and Stone will compile the Ultimate Guide to Grandparenting, including a checklist of memory-making activities for every grandparent to do with their grandkids, such as building a den or flying a kite, which they can tick off as they go.

And as we enter the new age of technology, the guide will also include the 20 Things Grandchildren think their Grandparents Ought to Know in the 21st Century. Whether it’s how to upload photos to Facebook, or finding funny videos on YouTube.

Everyone who shares a memory or suggestion will be entered into a prize draw to win £250 worth of John Lewis vouchers, with 3 runners-up each receiving £50 in Waitrose food vouchers.

Monica Collings, from McCarthy and Stone, commented: “Having the time and freedom to spend with your grandchildren pays dividends for retirees, and is treasured time that children will remember forever.

“Not only do grandparents take an active interest in their grandchildrens’ lives and interests, but they pass on valuable knowledge and advice, giving children a take on life that they might not otherwise get – something which is really important for us to cherish and celebrate.

“We are launching this handy guide to inspire locals in Stroud to share their fond memories and stories of their grandparents.”

To take part, please share your stories and suggestions on top memory-making activities that all grandparents should do with their grandchildren by emailing mccarthyandstone@mccann.com.

You can also post your ideas to: McCann PR, McCarthy and Stone Ultimate Guide, Communications House, Highlands Rd, Shirley B90 4WE.

The Ultimate Guide to Grandparenting will be launched at the end of October.