编辑同志:不久前,李老汉因患癌症,自感时日不久,遂请老友杨某代写了遗嘱一份,遗嘱交代李老汉名下的房屋一套由其外孙张某某继承。随后,李老汉叫来其女儿李某及外孙张某某,当着二人的面,在已经写好的遗嘱上签下了自己的名字,但签遗嘱时并没有其他人在场。半个月后,李老汉去世。请问,立遗嘱时没有见证人在场见证,遗嘱有效吗?读者王强王强同志:公民可以立遗嘱将个人财产赠给国家、集体或者法定继承人以外的人,但所立遗嘱应当具备一定的形式要 Edit Comrades: Not long ago, Li Lahan because of cancer, self-inductance sooner or later, then asked his friend Yang wrote a will, a will to account of the house under the name of Li Lao Han inherited by his grandson Zhang Moumou. Subsequently, Li Lao-han called her daughter Lee and grandson Zhang Moumou, in the face of the two, signed the will written on his own name, but the signing of the testament and no other presence. Half a month later, Lee old man died. Will Wang Qiang Wang Qiang, Comrade Wang Qiang: Citizens may, as wills, donate their personal property to persons other than state, collective or legal heirs, but the will to make wills must have a certain form