Though grammatically correct, it is very Anglicized and unnatural to Chinese ears.

我的家庭 - 1

我有家中庭。我有二兩 二 is the numeral "2"个妹妹。家庭 is almost like the English "house" as oppose to "home" 我的妹妹一个是23岁 另一个。 我的妹妹是21岁。我呢, 是27岁；我是她的姐姐。This is obvious, as in English.  我有妈妈也爸爸。This must appear before your sisters.  This is cultural bias and the order reflects on the importance of the social standing.  If you violate this rule, your writing will betrayed your roots as a non-Chinese speaker.  我家中有父母, 有兩个妹妹, 一个是... 我可是没有哥哥和或 Unlike English, you cannot use "or" but "and" 弟弟, 还养着我有三只狗。它们呻我的狗什么Bubbles，Toki，也 和 Charlie。我的狗不是美国狗。他它们是韩国种娄的狗。我的家庭是小。我爱我的家庭。 Unlike English, it will be strange to explicitly state these,  a Chinese speaker might think you are insulting their intelligence.  You only explicitly state these on the contrary.  Another note, if you really want to learn this language seriously, give an English version as well.  This way, we can help you nuance better your feeling.

我的家庭 - 1

我的家庭 - 1

      (In Chinese,when we want to express "it",we usually use "它" instead of"他"or "她".The "它" is used for something except human)

我的家庭 - 1

If you want to say ,my elder sister is 23 years old this year  ------我姐姐今年23岁  my  little sister is 23  _____我妹妹21岁

Without 是

写的不错

我的家庭 - 1

我是Christen。
我有家庭。我有二个妹妹。我的妹妹是23岁。 我的妹妹是21岁。我是27岁；我是她的姐姐。我有妈妈也爸爸。我没有哥哥或弟弟。我有三只狗。我的狗什么Bubbles，Toki，也Charlie。我的狗不是美国狗。他们韩国狗。我的家庭是小。我爱我的家庭。

我家有５口人：爸爸，妈妈，两个妹妹和我。我没有哥哥和弟弟，我妹妹一个２３岁，一个２１岁，我２７岁。我还有三只狗狗：Bubbles,Toki 和Charlie。他们不是美国狗，他们是韩国狗。我爱我的家。