If the other person does mention his family, then it is perfectly OK to ask about the ages of the children, and if you have children, to compare educational and cultural differences in raising children.
That area is relatively rich in natural resources.
その地域は鉱物資源が比較的豊かだ。
We measured the electricity used during air cooling in the same way as heating, and compared the old model air conditioner to the energy conservation (2001) model.
暖房と同様に、冷房時の消費電力量を測定し、旧型と省エネ型(2001年製)のエアコンを比較しました。
Solar energy seems to offer more hope than any other source of energy, particularly because those areas most in need of water lie rather close to the equator and have a relatively clear atmosphere.
Milk has to be kept at a relatively low temperature.
牛乳は比較的低温で保存する必要がある。
We weighed one opinion against the other.
我々は二つの意見を比較検討した。
Compare the copy with the original.
書き写したものを原文と比較せよ。
Let's contrast spring with fall.
春と秋とを比較対照してみよう。
The explanation below was achieved by comparing and contrasting a variety of different theories.
以下の説明は多くの異なる理論を比較的対照することによって得られたものである。
Let's compare his work with hers.
彼の作品を彼女のと比較してみよう。
Compared with last year, this year's crops are much better.
去年と比較して、今年の収穫はずっといい。
Compare your answers with the teacher's.
君の答えを先生のと比較せよ。
He compared the imitation with the original.
彼はその模造品を本物と比較した。
He compared the copy with the original.
彼の写しを元のものと比較してみた。
Prices are lower in Kobe.
神戸は比較的物価が安い。
Can you tell me how this compares to that?
あれとこれとを比較するとどちらがいいですか。
She speaks relatively quickly.
彼女は比較的早口だ。
Don't compare your children with others.
自分の子を他人の子と比較するな。
Compare your answer with Tom's.
あなたの答えとトムの答えと比較しなさい。
The prices of Japanese automobiles are still comparatively high.
日本車の価格は、比較的高い。
Nothing is to be compared to its beauty.
何もその美しさとは比較にならない。
In this paper, I compare the folklores of Germany and Holland.
この論文では、ドイツとオランダの民間伝承を比較する。
She speaks relatively fast.
彼女は比較的早口だ。
Compared to many other countries, the average intake of trans-fats per person in Japan is low and it is hypothesized that it does not have a strong impact on health.