Grandsonly

In writing to the Kaiser that he must withdraw that Kruger telegram, Grandma Victoria runs the risk of being told a conventional piece of grandsonly advice.

Source: wiktionary

You would be disappointed if you visited some of these Yorkshire towns expecting to find every man cherishing his neighbour like a brother or loving the Departments of State with a grandsonly love.

Source: wiktionary

Finally, let her pray that a miracle ma ybe^([sic]) vouchsafed her so that she will understand that she is no longer a fascinator and heart smasher, and that no man has any interest in her except in a grandsonly way.

Source: wiktionary

Standpatism is the clarified quintescence^([sic]) of social sin. To desire to be as good as one’s father is a laudable ambition, but the standpatter is bitterly opposed to being any better. He is determined to carry grandfatherly virtues into a grandsonly age. This is the ideal which for centuries has held progress bound in China. The son who is only as good as his father is worse than his father, for the father practiced the virtues of his time, while the son fell behind his.

Source: wiktionary